// LightTrack.h: interface for the CLightTrack class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_LIGHTTRACK_H__89914D61_AC0B_4C7C_BA8C_D7D810738CE7__INCLUDED_)
#define AFX_LIGHTTRACK_H__89914D61_AC0B_4C7C_BA8C_D7D810738CE7__INCLUDED_
#pragma once

const	float				lt_inc			= 4.f	;
const	float				lt_dec			= 2.f	;
const	int					lt_hemisamples	= 26	;

class	CROS_impl			: public IRender_ObjectSpecific
{
public:
	enum CubeFaces
	{
		CUBE_FACE_POS_X,
		CUBE_FACE_POS_Y,
		CUBE_FACE_POS_Z,
		CUBE_FACE_NEG_X,
		CUBE_FACE_NEG_Y,
		CUBE_FACE_NEG_Z,
		NUM_FACES
	};

	struct	Item			{
		u32					frame_touched		;	// to track creation & removal
		light*				source				;	// 
		collide::ray_cache	cache				;	//
		float				test				;	// note range: (-1[no]..1[yes])
		float				energy				;	//
	};
	struct	Light			{
		light*				source				;
		float				energy				;
		Fcolor				color				;
	};
public:
	// general
	u32						MODE				;
	u32						dwFrame				;
	u32						dwFrameSmooth		;

	// 
	xr_vector<Item>			track				;	// everything what touches
	xr_vector<Light>		lights				;	// 

	bool					result				[lt_hemisamples];
	collide::ray_cache		cache				[lt_hemisamples];
	collide::ray_cache		cache_sun			;
	s32						result_count		;
	u32						result_iterator		;
	u32						result_frame		;
	s32						result_sun			;
public:
	u32						shadow_gen_frame	;
	u32						shadow_recv_frame	;
	int						shadow_recv_slot	;
private:
	float					hemi_cube		[NUM_FACES];
	float					hemi_cube_smooth[NUM_FACES];

	float					hemi_value			;
	float					hemi_smooth			;
	float					sun_value			;
	float					sun_smooth			;

	Fvector					approximate			;

#if RENDER!=R_R1
	Fvector					last_position;
	s32						ticks_to_update;
	s32						sky_rays_uptodate;
#endif	// RENDER!=R_R1
public:
	virtual	void			force_mode			(u32 mode)		{ MODE = mode;															};
	virtual float			get_luminocity		()				{ float result = _max(approximate.x, _max(approximate.y, approximate.z)); clamp(result, 0.f, 1.f); return (result); };
	virtual float			get_luminocity_hemi	()				{ return get_hemi();}

	void					add					(light*			L);
	void					update				(IRenderable*	O);
	void					update_smooth		(IRenderable*	O=0);
	
	ICF	float				get_hemi			()	{
		if (dwFrameSmooth!=Device.dwFrame)		update_smooth();
		return									hemi_smooth;
	}
	ICF	float				get_sun				()	{
		if (dwFrameSmooth!=Device.dwFrame)		update_smooth();
		return									sun_smooth;
	}
	ICF Fvector3&			get_approximate		()	{
		if (dwFrameSmooth!=Device.dwFrame)		update_smooth();
		return									approximate;
	}

	const float*			get_hemi_cube		(){
		if (dwFrameSmooth!=Device.dwFrame)		update_smooth();
		return									hemi_cube_smooth;
	}

	CROS_impl				();
	virtual ~CROS_impl	()	{};

private:
	//static inline CubeFaces get_cube_face(Fvector3& dir);
	
	//Accumulates light from direction for corresponding faces
	static inline void accum_hemi(float* hemi_cube, Fvector3& dir, float scale);

	//Calculates sun part of ambient occlusion
	void calc_sun_value(Fvector& position, CObject* _object);

	//Calculates sky part of ambient occlusion
	void calc_sky_hemi_value(Fvector& position, CObject* _object);

	//prepares static or hemisphere lights for ambient occlusion calculations
	void prepare_lights(Fvector& position, IRenderable* O);

#if RENDER!=R_R1
	//	Updates only if makes a desizion that update is necessary
	void smart_update(IRenderable* O);
#endif	//	RENDER!=R_R1
};

#endif // !defined(AFX_LIGHTTRACK_H__89914D61_AC0B_4C7C_BA8C_D7D810738CE7__INCLUDED_)
